linux-kernel - Re: [PATCH v2 07/11] drm/msm/disp/dpu1: Add DSC support in hw

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Message-ID: <f5f6162c-7ed0-2964-7cf9-0bb894c8b4f5@linaro.org>
Date:   Thu, 14 Oct 2021 17:06:53 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Vinod Koul <vkoul@...nel.org>, Rob Clark <robdclark@...il.com>
Cc:     linux-arm-msm@...r.kernel.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Jonathan Marek <jonathan@...ek.ca>,
        Abhinav Kumar <abhinavk@...eaurora.org>,
        Jeffrey Hugo <jeffrey.l.hugo@...il.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org
Subject: Re: [PATCH v2 07/11] drm/msm/disp/dpu1: Add DSC support in hw_ctl

On 07/10/2021 10:08, Vinod Koul wrote:
> Later gens of hardware have DSC bits moved to hw_ctl, so configure these
> bits so that DSC would work there as well
> 
> Signed-off-by: Vinod Koul <vkoul@...nel.org>
> ---
> Changes since
> v1:
>   - Move this patch from 6 to 7 due to dependency on 6th one
>   - Use DSC indices for programming DSC registers and program only on non
>     null indices
> 
>   drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c | 12 ++++++++++--
>   1 file changed, 10 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c
> index 3c79bd9c2fe5..8ea9d8dce3f7 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c
> @@ -25,6 +25,8 @@
>   #define   CTL_MERGE_3D_ACTIVE           0x0E4
>   #define   CTL_INTF_ACTIVE               0x0F4
>   #define   CTL_MERGE_3D_FLUSH            0x100
> +#define   CTL_DSC_ACTIVE                0x0E8
> +#define   CTL_DSC_FLUSH                0x104
>   #define   CTL_INTF_FLUSH                0x110
>   #define   CTL_INTF_MASTER               0x134
>   #define   CTL_FETCH_PIPE_ACTIVE         0x0FC
> @@ -34,6 +36,7 @@
>   
>   #define DPU_REG_RESET_TIMEOUT_US        2000
>   #define  MERGE_3D_IDX   23
> +#define  DSC_IDX        22
>   #define  INTF_IDX       31
>   #define CTL_INVALID_BIT                 0xffff
>   
> @@ -120,7 +123,6 @@ static u32 dpu_hw_ctl_get_pending_flush(struct dpu_hw_ctl *ctx)
>   
>   static void dpu_hw_ctl_trigger_flush_v1(struct dpu_hw_ctl *ctx)
>   {
> -
>   	if (ctx->pending_flush_mask & BIT(MERGE_3D_IDX))
>   		DPU_REG_WRITE(&ctx->hw, CTL_MERGE_3D_FLUSH,
>   				ctx->pending_merge_3d_flush_mask);
> @@ -128,7 +130,6 @@ static void dpu_hw_ctl_trigger_flush_v1(struct dpu_hw_ctl *ctx)
>   		DPU_REG_WRITE(&ctx->hw, CTL_INTF_FLUSH,
>   				ctx->pending_intf_flush_mask);
>   
> -	DPU_REG_WRITE(&ctx->hw, CTL_FLUSH, ctx->pending_flush_mask);

This would break non-DSC case.

>   }
>   
>   static inline void dpu_hw_ctl_trigger_flush(struct dpu_hw_ctl *ctx)
> @@ -498,6 +499,9 @@ static void dpu_hw_ctl_intf_cfg_v1(struct dpu_hw_ctl *ctx,
>   	u32 intf_active = 0;
>   	u32 mode_sel = 0;
>   
> +	if (cfg->dsc)
> +		DPU_REG_WRITE(&ctx->hw, CTL_DSC_FLUSH, cfg->dsc);
> +
>   	if (cfg->intf_mode_sel == DPU_CTL_MODE_SEL_CMD)
>   		mode_sel |= BIT(17);
>   
> @@ -509,6 +513,10 @@ static void dpu_hw_ctl_intf_cfg_v1(struct dpu_hw_ctl *ctx,
>   	if (cfg->merge_3d)
>   		DPU_REG_WRITE(c, CTL_MERGE_3D_ACTIVE,
>   			      BIT(cfg->merge_3d - MERGE_3D_0));
> +	if (cfg->dsc) {
> +		DPU_REG_WRITE(&ctx->hw, CTL_FLUSH, ctx->pending_flush_mask |  BIT(DSC_IDX));

Why?

> +		DPU_REG_WRITE(c, CTL_DSC_ACTIVE, cfg->dsc);
> +	}
>   }
>   
>   static void dpu_hw_ctl_intf_cfg(struct dpu_hw_ctl *ctx,
> 


-- 
With best wishes
Dmitry